Convex multi-level chess board



FIG. 1 is a perspective view of a convex multi-level chess board according to the present invention;

FIG. 2 is a right-side elevation view thereof; and,

FIG. 3 is a left-side elevation view thereof.

The bottom is plain and unornamented. 

The ornamental design for a convex multi-level chess board, as shown and described. 